Rich and poor countries are in this together. If either fails to step up, the planet is in trouble. A climate deal must take into account the Global North’s responsibility for nearly 70 percent of greenhouse pollution and the Global South’s need to move out of poverty. The North must cut back sharply on emissions while the South leapfrogs over the industrial age to clean-energy prosperity.

Kumi Naidoo is building a global movement to force world leaders to adopt a binding agreement on climate change. He is executive director of Greenpeace International and has led TckTckTck, a global campaign for climate action.

Clayton Thomas-Müller is working to keep corporations from privatizing the atmosphere, as they have privatized the land and exploited the natural resources that once belonged to the First Nations of Canada.